Direct measurements of electron thermalization in Coulomb blockade nanothermometers at millikelvin temperatures

We investigate electron thermalization of tunnel junction arrays installed in a powerful dilution refrigerator whose mixing chamber can produce lattice temperatures down to 3 mK. The on-chip Coulomb blockade thermometers (CBT) against other thermometers at the mixing chamber provide direct informati...

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Bibliographic Details
Published in:Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 1998-12, Vol.3 (4), p.224-228
Main Authors: Knuuttila, T.A., Nummila, K.K., Yao, W., Kauppinen, J.P., Pekola, J.P.
Format: Article
Language:English
Subjects:
Coulomb blockade
Electron thermalization
Nanotechnology
Thermometry
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Summary:We investigate electron thermalization of tunnel junction arrays installed in a powerful dilution refrigerator whose mixing chamber can produce lattice temperatures down to 3 mK. The on-chip Coulomb blockade thermometers (CBT) against other thermometers at the mixing chamber provide direct information on the thermal equilibrium between the electronic system and the refrigerator. We can detect and discriminate between the heat load delivered through the wiring and that produced by the bias current of the CBT-measurement. The basic heat leak limits the minimum of the electronic temperature to slightly below 20 mK.
ISSN:1386-9477
1873-1759
DOI:10.1016/S1386-9477(98)00207-0